Tag: chemistry

Questions Related to chemistry

Among the following, the highest value of prefix is:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. yocto

  2. deca

  3. giga

  4. yotta

Show answer
Correct Option: D
Explanation:

Yocto= $10^{-24}$,             Deca= $10^1$

Griga=$10^9$,                    Yotta=$10^{24}$

Therefore, the highest value of prefix is Yotta  $10^{24}$

The correct option is (D)

The standard temperature is:

chemistry basic concepts of chemistry measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $273^0C$

  2. $273K$

  3. $-273K$

  4. $23K$

Show answer
Correct Option: B
Explanation:

The standard temperature is considered to be $273K$

i.e. $0°C$

The S.I unit of atmospheric pressure is :

chemistry basic concepts of chemistry measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $L\ atm$

  2. $N/m$

  3. $Pascal$

  4. None of these

Show answer
Correct Option: C
Explanation:

The S.I unit of atmospheric pressure is $N/m^2$ or $Pascal$.

           $1\quad Pascal =1N/m^2$
           $1\quad atm =101325\quad Pascal$
           $1\quad bar =10^5\quad Pascal$

What is the SI unit of mass? 

chemistry basic concepts of chemistry measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. kg

  2. LBS

  3. Pounds

  4. None of these

Show answer
Correct Option: A
Explanation:

  • SI unit definition is a unit of measurement that is a universally accepted system used for scientific and technical work all over the world.
  • The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram, a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (BIPM).

Unit of luminous intensity is:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. mole

  2. candela

  3. kelvin

  4. ampere

Show answer
Correct Option: B
Explanation:

Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle.


Based on the luminosity function, a standardized model of the sensitivity of the human eye. 
The SI unit of luminous intensity is candela(cd).

So, option ( B ) is correct.

The symbol of S.I unit of amount of substance is:

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. mole

  2. density

  3. equivalent weight

  4. molecular weight

Show answer
Correct Option: A
Explanation:

Mole is used to represent the amount of a substance. For an element or a compound, mole is given by


$n=\dfrac{Weight\ in\ grams}{Molecular\ Weight}$

Its SI unit is $mole$.

Which one of the following temperatures is approximately equal to "room temperature ?"

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $0\ K$

  2. $293\ K$

  3. $100$ Degree Celsius

  4. $0$ Degree Celsius

Show answer
Correct Option: B

One fermi is?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $10^{-15}$ cm

  2. $10^{-13}$ cm

  3. $10^{-10}$ cm

  4. $10^{-12}$ cm

Show answer
Correct Option: B
Explanation:

One fermi = $10^{-15}m = 10^{-13}cm$ .

The temperature of absolute zero is _______

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $273.15^{0}C$

  2.  $0^{0}C$

  3. $-373^{0}C$

  4. $-273.15^{0}C$

Show answer
Correct Option: D
Explanation:

The temperature of absolute zero is $T=t+273.15$


Absolute Zero$=T=0$ 


Then $0=t+273.15 ^0C$ 

$t=-273.15 ^oC$

S.I unit for the coefficient of viscosity is equal to?

chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. $Nm^{-1}s$

  2. $Pa s^{-1}$

  3. $Nm^{-2} s$

  4. $Pa s^{-2}$

Show answer
Correct Option: C